 Beginning in 1925, an estimated 16 "Song Car-tunes" were produced using the Phonofilm sound-on-film process developed by Lee DeForest beginning with "Come Take a Trip on My Airship".The remaining 31 titles were released silent, designed to be played with live music in theaters.The Fleischer brothers partnered with DeForest, Edwin Miles Fadiman, and Dr. Hugo Riesenfeld to form Red Seal Pictures Corporation, which owned 36 theaters on the East Coast, extending as far west as Cleveland, Ohio.